chore(generic-metrics): Add new options to toggle dropping percentiles (#70889)

We'll have 2 new options, one for disabling percentiles storage for an
entire use case and another for org-level disabling. For both options,
we have a simple list as the format

Author: ayirr7

src/sentry/options/defaults.py

@@ -1244,6 +1244,22 @@
     flags=FLAG_AUTOMATOR_MODIFIABLE,
 )
 
+# Option to remove support for percentiles on a per-org basis.
+# Add the org_id to list to disable percentiles.
+register(
+    "sentry-metrics.drop-percentiles.per-org",
+    default=[],
+    flags=FLAG_AUTOMATOR_MODIFIABLE,
+)
+
+# Option to remove support for percentiles on a per-use case basis.
+# Add the use case to list to disable percentiles.
+register(
+    "sentry-metrics.drop-percentiles.per-use-case",
+    default=[],
+    flags=FLAG_AUTOMATOR_MODIFIABLE,
+)
+
 # Global and per-organization limits on the writes to the string indexer's DB.
 #
 # Format is a list of dictionaries of format {